// This code is derived from jcifs smb client library <jcifs at samba dot org>
// Ported by J. Arturo <webmaster at komodosoft dot net>
//  
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
// 
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// Lesser General Public License for more details.
// 
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
namespace SharpCifs.Smb
{
    internal abstract class SmbComNtTransaction : SmbComTransaction
    {
        private const int NttPrimarySetupOffset = 69;

        private const int NttSecondaryParameterOffset = 51;

        internal const int NtTransactQuerySecurityDesc = 6;

        internal int Function;

        public SmbComNtTransaction()
        {
            // relative to headerStart
            primarySetupOffset = NttPrimarySetupOffset;
            secondaryParameterOffset = NttSecondaryParameterOffset;
        }

        internal override int WriteParameterWordsWireFormat(byte[] dst, int dstIndex)
        {
            int start = dstIndex;
            if (Command != SmbComNtTransactSecondary)
            {
                dst[dstIndex++] = MaxSetupCount;
            }
            else
            {
                dst[dstIndex++] = unchecked(unchecked(0x00));
            }
            // Reserved
            dst[dstIndex++] = unchecked(unchecked(0x00));
            // Reserved
            dst[dstIndex++] = unchecked(unchecked(0x00));
            // Reserved
            WriteInt4(TotalParameterCount, dst, dstIndex);
            dstIndex += 4;
            WriteInt4(TotalDataCount, dst, dstIndex);
            dstIndex += 4;
            if (Command != SmbComNtTransactSecondary)
            {
                WriteInt4(MaxParameterCount, dst, dstIndex);
                dstIndex += 4;
                WriteInt4(MaxDataCount, dst, dstIndex);
                dstIndex += 4;
            }
            WriteInt4(ParameterCount, dst, dstIndex);
            dstIndex += 4;
            WriteInt4((ParameterCount == 0 ? 0 : ParameterOffset), dst, dstIndex);
            dstIndex += 4;
            if (Command == SmbComNtTransactSecondary)
            {
                WriteInt4(ParameterDisplacement, dst, dstIndex);
                dstIndex += 4;
            }
            WriteInt4(DataCount, dst, dstIndex);
            dstIndex += 4;
            WriteInt4((DataCount == 0 ? 0 : DataOffset), dst, dstIndex);
            dstIndex += 4;
            if (Command == SmbComNtTransactSecondary)
            {
                WriteInt4(DataDisplacement, dst, dstIndex);
                dstIndex += 4;
                dst[dstIndex++] = unchecked(unchecked(0x00));
            }
            else
            {
                // Reserved1
                dst[dstIndex++] = unchecked((byte)SetupCount);
                WriteInt2(Function, dst, dstIndex);
                dstIndex += 2;
                dstIndex += WriteSetupWireFormat(dst, dstIndex);
            }
            return dstIndex - start;
        }
    }
}
